Answer:
x = 30
Step-by-step explanation:
The sum of interior angles in a triangle is equal to 180
The given is a right triangle so one of the angle is 90 degrees:
90 + 2x + x = 180 add like terms
90 + 3x = 180 subtract 90 from both sides
3x = 90 divide both sides by 3
x = 30
